<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <button id="aaa">点击</button>
    <script>
      document.write("<br>");
      function wqz() {
        document.write("she is so cute!!");
        document.write("<br>");
      }
      var abc = function () {
        document.write("abc!!");
      };
      wqz();
      abc();
      aaa.onclick = abc;
    </script>
  </body>
</html>
